I'm new to trp and not very natural at this at all (though I do have looks going for me). I just had a successful Tinder experience and I'd like some feedback.

We matched and set up a date (both of us are about 28). Timing is hard (conflicting schedules), but we find a time both are free for ~30 min.

On the date she tells me I seem nervous. I don't reply to this but try to control body language better. I escalate touch and she is receptive. She tells me she likes that I'm fit, but negs me that I'm too skinny. I respond with something to the effect "yeah I'm trying to get bigger without getting fat" [shit test failed].

We talk some more, including more sexual topics, then I tell her I have to get going (work). We have difficult schedules but I tell her I can make some time when she's free. It's seems apparent even to me that she wants to fuck. I shift my schedule a bit so we can meet at my place in 3 days. I kiss her and we part. She texts me later that day that she can't wait to meet again and wanted to kiss more. I respond back something like "Yes that sounds good."

Night before I text to confirm that we're meeting:

Me: See you tomorrow?

Her: [morning of] Something's come up, can we reschedule?

Me: [without thinking, just auto-beta response] Sure, when are you free?

Her: Not next week, but the week after. But meanwhile we can get to know each other texting.

Me: See if you can get around whatever came up. Let me know before [time] today. I don't think I'll be free in a couple of weeks.

Her: I'm trying, but it's difficult.

Me: I'll be away from my phone soon. [this is true, I'll be in the gym - 45lb plates before spun plates]

Her: Can we meet 30 minutes earlier instead?

Me: Yes

Her: Okay

Me: See you at [time], [location]

Her: Okay

She's right on time, she comes up. She gives me some shit about how far she drove. I shrug. We start making out. We fuck. She likes it rougher than any girl I've been with before. I'm not used to being that rough, but I warm up to it. Afterwards she blows me. A great time for both of us as far as I can tell.

Before she leaves she tells me that I'm kind of quiet, but that she had a better time than she was expecting. She was clearly enthusiastic throughout, so why the last minute attempt to cancel? I was thinking maybe because she was looking for more validation through texting before we met. Is that reasonable? If not, then what was it about?